Metallurgical filter.



No. 702,064. Pate'nted lune I0, |902.

F. H. LONG,

METALLUHGICAL FILTER.

(Application led June 24, 1901. Renew'ed Feb. 27, 1902.)

me Nonms Pz'rgns co. PnoTo-LWHO. WASHINGYN. n. c.

AUNITED i STATES PATENT 'EEE'DEEIOIL LONG, oF CHICAGO, ILLINOIS; f.; '1

METALLURGloAL FILTER.

SPECIFICATION forming part of LettersvPatent No. 702,064, dated J' une 10, 1902.

Application iiled June 24,1901. Renewed February Z7, 1902. Serial No. 95,945. (No model.)

` .To LZZ whom, it may concern:

Be it known that I, FREDERIC H. LONG, a

f washing and filtration of the gangue this ashave invented certain new and useful Improvements in Metallurgical Filters, of which the following is a full, clear, and exact description.

In wet meth'odsfor extracting metals from their pulverized ores vby aid of proper solvents the refuse gangue left at the close of the' extraction stage necessarily retains a notable` percentage of rich solution. Under careful sociated solutionis oftentimes recovered and utilized. l

The present invention seeks to provide an apparatus primarily suited -for rapid treat-- ment of the refuse gangue, a charge thereof,- together with .the residual solution which ac-V companies it, being repeatedly washed under hydrostatic pressure'to promote rapid filtra'" from any adherent slinles.V

tion of the solution.'`

. The accompanying drawingidispla'ysthe'V preferred fornl of the invention inlongitudi-A nal vertical section.

The filter-tank consists of acylindricshell 10, to which the top andbottom heads 11" 12 are tightly riveted, the several parts being preferably of sheet metal to better withstand heavy pressure. The tank interior is coated over with asphalt or other suitable paint to prevent corrosion. The body lO and bottom l2 of the tank have numerous small vents which are covered at the inside by a filterseptum 14, generally of canvas or cotton duck. The ends of the fabric overlap the edges of a wire-'netting 15 16, which restsY against the tank-walls and serves as a stretcher to trimlyy sustain the septum in place. V'The netting is of mesh small enough to prevent the fabricfrom working'through4 or being torn at the vent-holes. valve 18 and a relief branch 19 for escapeof confined gases, leads into the tank centrally at the bottom and conveniently sustains the drip-pan 20, with its exit-tube 21, said pan serving to catch the iiltrate expelled through the holes of the main vessel. As the charge "the tank becomes full.

iter control. pipe 23 is shut oft', whilevalved outlet 27 at Feed-pipe 17, having a controlv tobefiltered flows into the tank the top cock 22 stands open for release ofV air-and separated gases', but, together with valve-18 in the feed-pipe, is quickly closed again when water under heavy pressure-e. g., two hundred pounds-is now admitted by tube 23 into pipe 17. The water rises through the tankbottom and because of its high head soon banks the gangue against the filter-septum for .thorough scouring, the clear solution or ltrate being forced out at the vent-holes and "thence into the drip-pan beneath. Waterpipe 23 is equipped with regulating-cock 24, check-valve 25, and pressure-gage 26 for betbottorn and cover 29 for manhole 28 at top of lthe tank are thrown open for rapid discharge ofthe refuse, ahose-stream introduced through the manhole'soon clearing the filter The details of structure can be varied in keeping with the mechanics skill without departing from theessentials of the invention. j Having thus described my invention, what I claim as new, and desire to lsecure by Letters Patent, isf;

y1. In metallurgie lters, the combination with the closed perforated tank having an internal fabric septum with stretcherframe rtherefor to rest against the tank-walls of the `feed-pipe leading into the tank-bottom and the separate Wash-water-pressure tube unitedV to said feed-pipe between the inlet and outlet valves thereof, substantially as described.

2. In metallurgie filters, the combination with the closed, perforated tank having an internal fabric septum and external drip-pan',

A supply of wash` With the close of the treatment of the feed-pipe openinginto the tank-bottom c and the separate wash-water-pressure tube, substantially as described. 'f f 3. In metallurgie filters, the combination with the closed, perforated tank having an external drip-pan and an internal fabric Septum with stretcher-frame therefor to' rest against the tank-walls, of the feed-pipe leading into the tank-bottom and the separate Wash-Water-pressure tube united to said feedand the Wash -Water pressure tube leading pipe betweenthe inlet and outlet Valves thereinto the tank bottom, substantially as delo of, substantially as described. scribed.

4:. In metallurfrie filters, the combination 5 with the closed prforated vertical tank hav- FREDERIC H LONG ing an internal fabric septum with streteher- Vitnesses: frame therefor to rest against the tank-walls ALBERTA ADAMICK, ofthe feed-pipe discharging into said Jsank HARRY L. CLAPP. 

